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(11)    Patent No :    AP 2598   
(21)    Application No :    AP/P/2009/005080   
(22)    Filing Date :    15.06.2009   
(24)    Date of Grant &    25.02.2013   
(45)    Publication :

(30)  Priority Data           
(33) Country    (31)    Number    (32) Date
JP    2008    -155070    13.06.2008
JP    2008    -188428    22.07.2008

(84)    Designated State

BW    GM  GH   KE   LS   MW  MZ   NA   SL

SD    SZ   T Z   UG   ZM   ZW
(73) Applicant(s)

YAMAHA HATSUDOKI KABUSHIKI KAISHA, 2500 Shingai, Iwata-shi, Shizuoka- ken,

(72) Inventors

KONAKAWA Tsugunori, Japan

TAKAHASHI Yusuke, Japan

(74) Representative

(51)  International  Classification   F01N 1/02 (2006.01)    F01N 3/20 (2006.01)
F01N 1/14 (2006.01)   
(54)    Title

Internal combustion engine, vehicle, marine vessel, and secondary air supply method for internal combustion engine

(57)    Abstract

An internal combustion engine capable of efficiently supplying air to an exhaust path even in a high load state is provided. The internal combustion engine 1 includes a convergent section 32, a divergent section 33, and a branch section 21. The branch section 21 branches a shock wave 35, propagating in a downstream direction at a higher velocity than exhaust gas 36 flowing into an exhaust path 16 from a 10 combustion chamber when an exhaust valve 9 is opened, from a portion of the exhaust path 16 which is upstream with respect to the divergent section 33, and propagates the shock wave 35 back to the exhaust path 16. The exhaust gas 36 is caused to pass the convergent section 32 and to collide against the shock wave 35 between the branch section 21 and the divergent section 33, thus to increase the pressure of the exhaust gas 36 in the convergent section 32. Such exhaust gas 36 is caused to pass the divergent section 33 to generate a new shock wave 35b. A secondary air supply system 70 includes a supply section 73 for supplying air to a portion of the exhaust path 16 which is upstream with respect to the divergent section 33, using a negative pressure generated by the newly generated shock wave 35b

(56)    Documents Cited :    US-4926638    WO-0206456    WO-0121941    JP-61155620 A


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